No, expressions cannot have the same value in algebra. They may be assigned to different values and on solving we can get different answers in each case.
In C++ all false relational expressions have a mathematical value of 0.
The answer follows.
They are callled: Identical equations or Identities See: http://www.tutorvista.com/search/value-algebraic-expressions
It is an equation
In mathematical expressions, a variable (a letter used to represent a certain value) represents an unknown or changeable value. It is often the variable x.
A sentence which defines a value of variables in a mathematical problem is called a statement. The relationship between variables in a mathematical problem is called a function.